18518516685352 has 16 divisors (see below), whose sum is σ = 34727372844660. Its totient is φ = 9257883926784.

The previous prime is 18518516685343. The next prime is 18518516685353. The reversal of 18518516685352 is 25358661581581.

It can be written as a sum of positive squares in 2 ways, for example, as 18441751116996 + 76765568356 = 4294386^2 + 277066^2 .

It is not an unprimeable number, because it can be changed into a prime (18518516685353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171744723 + ... + 171852514.

Almost surely, 2^{18518516685352} is an apocalyptic number.

It is an amenable number.

18518516685352 is a deficient number, since it is larger than the sum of its proper divisors (16208856159308).

18518516685352 is a wasteful number, since it uses less digits than its factorization.

18518516685352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343603980 (or 343603976 counting only the distinct ones).

The product of its digits is 69120000, while the sum is 64.

The spelling of 18518516685352 in words is "eighteen trillion, five hundred eighteen billion, five hundred sixteen million, six hundred eighty-five thousand, three hundred fifty-two".